ACE710C

ACE710C
1A Synchronous PWM Boost converter
Description
The ACE710C is a step-up converter that provides a boosted output voltage from a low voltage source.
Because of its proprietary design, it starts up at a very low input voltage down to 0.9V, and only consumes
15uA at standby, making it an ideal choice for single cell alkaline/NiMH battery operations.
A switching frequency of 1MHz minimizes solution footprint by allowing the use of tiny, low profile
inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing
external parts count.
ACE710C is available in SOT23-5 Package.
Features
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Efficiency up to [email protected]=4.0V, Vout=5.0V
Typical 15uA standby current
1MHz Switching Frequency allows small inductor and output cap
Input boost-strapping allows using small or no input cap
Low Vin Start-up Voltage down to 0.9V Ideal for Single Alkaline Cell operations
Maximum Output Current up to 1A
Low Noise PWM control
Internally Compensated Current Mode Control
Internal Synchronous Rectifier
Logic Control Shutdown (IQ<1uA)
Available in SOT23-5
Applications
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One to Three Cell Battery Operated Devices
Medical Instruments
Bluetooth Headsets
Flash-Based MP3 Players
Noise Canceling Headphones
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ACE710C
1A Synchronous PWM Boost converter
Absolute Maximum Ratings
Parameter
Value
SW Voltage
-0.3V~6V
EN,OUT Voltage
-0.3V~6V
Max Operating Junction Temperature(Tj)
125℃
Maximum Power Dissipation
SOT-23-5
450mW
Ambient Temperature(Ta)
-40~85℃
Storage Temperature(Ts)
-55~150℃
Lead Temperature & Time
260℃,10S
Note: Exceed these limits to damage to the device.
Exposure to absolute maximum rating conditions may affect device reliability.
Packaging Type
SOT-23-5
PIN #
NAME
1
EN
2
OUT
3
NC
4
GND
5
SW
DESCRIPTION
Enable pin for the IC. Drive the pin to high to enable the part, and low to disable
Output voltage pin, with 10uF ceramic capacitor closely connected to GND
No connection
Ground
To connect inductor to VIN
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ACE710C
1A Synchronous PWM Boost converter
Ordering information
ACE710C XX XX + H
Halogen - free
Pb - free
BN : SOT-23-5
Output Voltage: 1.8V=18……..5.5V=55
Typical Application
Block Diagram
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ACE710C
1A Synchronous PWM Boost converter
Electrical Characteristics
O
TA=25 C
Symbol
Vin
Parameter
Test Conditions
Input Voltage Range
Min Typ
0.9
Vstart
Startup Voltage
Iout = 1mA
0.9
Vhold
Hold Voltage
Iout = 50mA
0.5
Vout
Fsoc
Output Voltage Range
5
V
V
0.7
V
5.5
V
Iout = 0mA
2
Line regulation
Iout = 50mA
0.1
0.2
%/V
Load regulation
Iout = 0~300mA
1
2
%
%
Switching Frequency
Vout=0.95Vo, No inductor
0.7
1
1.4
MHz
Max Duty cycle
Vout=0.95Vo, No inductor
85
90
95
%
Vout=1.05*Vo
5
8
15
uA
20
uA
1
uA
Supply current at Vin
Shutdown Supply Current at Vin
RdsonP
Unit
Output voltage accuracy
Quiescent Current at Vout
IQ
1.8
Max
Iout = 0mA
EN=0
0.1
Efficiency
Iout = 100mA
PMOS Rdson
Isw =100mA
200
300
mohm
Isw =100mA
Vout=5.2V, Vsw=0 or
5.2V,EN=0
100
150
mohm
1
uA
RdsonN NMOS Rdson
Iswlk
SW Leakage Current
Vh_en
EN Input High Voltage
Vl_en
EN Input Low Voltage
85
%
1
V
0.3
V
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ACE710C
1A Synchronous PWM Boost converter
Typical Performance Characteristics
Test conditions: Cin= Cout=10uF, TA=25℃, unless otherwise specified.
Efficiency vs. Output Current
(Vout=5V)
Iout (A)
Output Voltage vs. Output Current
(Vout=5V)
Iout (A)
Efficiency vs. Output Current
(Vout=3V)
Iout (A)
Output Voltage vs. Output Current
(Vout=3V)
Iout (A)
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ACE710C
1A Synchronous PWM Boost converter
Detailed description
ACE710C is a low input voltage start up, current mode DC-DC step up converter. It’s operation can be
best understood by referring to the block diagram. Upon starting up, the low voltage startup circuitry
drives SW with on-off cycles, transferring energy from input to OUT by storing energy in the inductor
during on-time and releasing it to the output during off-time. When OUT is high enough, the startup circuit
turns off and the main controller takes over. The main control loop consists of a reference, a GM error
amplifier, a PWM controller, a current sense amplifier, an oscillator, a PWM logic control, and it is power
stage including its driver. The main control loop is a classic current mode control loop. The GM stage
integrates the error between FB and REF, and its output is used to compare with a triangular wave which
the summing result of the current sense amplifier output and a slope compensation voltage. The output of
the comparator is used to drive the power stage to reach regulation.
APPLICATION INFORMATION
Inductor selection
With switching frequency up to 1MHz, small surface mount inductors can be used with values from
2.2uH to 4.7uH.For a given chosen inductor value and application conditions make sure the peak inductor
current does not exceed the maximum current rating of the selected vendor's inductor.
Input and output capacitor selection
The ACE710C's bootstrap architecture allows the use of very small input capacitor. For applications that
only need to drive small output load current, the input capacitor is optional, because once output is started
up, the IC's is powered by OUT, a quiet power supply.
The output capacitor is used to stabilize the loop and provide ac current to the load. A low ESR ceramic
cap with values from 2.2uF to 22uF can be used. Smaller value capacitors are generally cheaper
with small footprints, while larger capacitor provides lower ripples and better transient load
responses. Also, when extreme low startup voltage is needed, larger output capacitors are needed for the
part to startup under heavy load condition.
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ACE710C
1A Synchronous PWM Boost converter
Packing Information
SOT-23-5
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ACE710C
1A Synchronous PWM Boost converter
Notes
ACE does not assume any responsibility for use as critical components in life support devices or systems
without the express written approval of the president and general counsel of ACE Electronics Co., LTD.
As sued herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and shoes failure to perform when properly used in
accordance with instructions for use provided in the labeling, can be reasonably expected to result in
a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can
be reasonably expected to cause the failure of the life support device or system, or to affect its safety
or effectiveness.
ACE Technology Co., LTD.
http://www.ace-ele.com/
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